Please whitelist cPanel in your adblocker so that you’re able to see our version release promotions, thanks!

The Community Forums

Interact with an entire community of cPanel & WHM users!

In Outlook server doesn't support the encryption method specified error

Discussion in 'E-mail Discussion' started by IRZQ88, Jul 3, 2018.

  1. IRZQ88

    IRZQ88 Active Member

    Joined:
    Sep 18, 2016
    Messages:
    26
    Likes Received:
    4
    Trophy Points:
    3
    Location:
    Indonesia
    cPanel Access Level:
    Root Administrator
    Yesterday when i setup a new VPS server, after migrating and changing nameserver, my client cannot send nor receive emails from my VPS server through Outlook. Doesn't matter which Outlook version, but if it using Windows 7 OS PC, i'll get an error 0x800CCC1A that saying my server doesn't support the encryption method specified. But if it using Windows 10, it can receive and sent emails normally.

    I even had copy my Exim configuration from the old VPS using transfer tools, but the result is the same. Then i'm trying to update the "SSL/TLS Cipher Suite List" and "Options for OpenSSL" as this posting mentioned, but the result still the same, nothing change, my clients with Windows 7 OS still couldn't send nor receive email with the same errors.

    FYI, I've attached my settings screenshot below and I'm using cPanel version 72.0.7.

    So finally I've decided to change my nameserver to my old VPS, and it works normally for Windows 7 or Windows 10. This is very weird! :(

    Anybody could help please? Thank you.
     

    Attached Files:

    #1 IRZQ88, Jul 3, 2018
    Last edited: Jul 3, 2018
  2. mtindor

    mtindor Well-Known Member

    Joined:
    Sep 14, 2004
    Messages:
    1,344
    Likes Received:
    58
    Trophy Points:
    178
    Location:
    inside a catfish
    cPanel Access Level:
    Root Administrator
    Just to get you going -- I would expect you to make a determination whether or not to use these settings long term.

    Dovecot:
    Code:
    SSL Cipher List:  ALL:!ADH:RC4+RSA:+HIGH:+MEDIUM:-LOW:-SSLv2:-EXP

SSL Protocols:  !SSLv2 !SSLv3
    Exim [Home --> Service Configuration --> Exim Configuration Manager --> Security]
    Code:
    Options for OpenSSL:

+no_sslv2 +no_sslv3

SSL/TLS Cipher Suite List:

ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:!DSS
    /scripts/restartsrv_dovecot
    /scripts/restartsrv_exim

    NOTE: Make sure you make note of your current configuration. If the above info doesn't work for you, revert back. If you use this information and then suddenly something doesn't start back up, I can't help you. It's easy to revert back if you have kept a record of the previous settings.

    Mike
     
    Stop hovering to collapse... Click to collapse... Hover to expand... Click to expand...
    #2 mtindor, Jul 3, 2018
    IRZQ88 likes this.
  3. IRZQ88

    IRZQ88 Active Member

    Joined:
    Sep 18, 2016
    Messages:
    26
    Likes Received:
    4
    Trophy Points:
    3
    Location:
    Indonesia
    cPanel Access Level:
    Root Administrator
    Thanks for the fast response Mike! But sorry, i don't understand what do you mean by this one?:

    Code:
    Dovecot:

SSL Cipher List:  ALL:!ADH:RC4+RSA:+HIGH:+MEDIUM:-LOW:-SSLv2:-EXP

SSL Protocols:  !SSLv2 !SSLv3
     
    #3 IRZQ88, Jul 3, 2018
  4. mtindor

    mtindor Well-Known Member

    Joined:
    Sep 14, 2004
    Messages:
    1,344
    Likes Received:
    58
    Trophy Points:
    178
    Location:
    inside a catfish
    cPanel Access Level:
    Root Administrator
    Dovecot is the IMAP/POP3 server, and you need to make sure that it's SSL/TLS settings work with Outlook as well.

    WHM --> Service Configuration --> Mailserver Configuration

    In there you'll see the SSL Cipher List and SSL Protocols sections if you are running Dovecot.

    If you are just making changes to Exim, that only handles any issues you may have been having _sending_ mail with Outlook. If you have issues _receiving_ mail with Outlook, that's all Dovecot.

    Mike
     
    Stop hovering to collapse... Click to collapse... Hover to expand... Click to expand...
    #4 mtindor, Jul 3, 2018
  5. IRZQ88

    IRZQ88 Active Member

    Joined:
    Sep 18, 2016
    Messages:
    26
    Likes Received:
    4
    Trophy Points:
    3
    Location:
    Indonesia
    cPanel Access Level:
    Root Administrator
    I see.. Thanks Mike for this great explanation! I'll update the result here soon! :)
     
    #5 IRZQ88, Jul 3, 2018
  6. mtindor

    mtindor Well-Known Member

    Joined:
    Sep 14, 2004
    Messages:
    1,344
    Likes Received:
    58
    Trophy Points:
    178
    Location:
    inside a catfish
    cPanel Access Level:
    Root Administrator
    You should also read the following thread [to make sure your Windows 7 is as up to date as it can be with regard to supporting various SSL/TLS options, etc. After all, the only ones with problems sending/receiving emails with the cPanel-preferred SSL/TLS settings for services are those running outdated operating systems, operating systems that haven't been updated, or email clients that haven't been updated. If you can fix the email client / client computer, you don't have to lower security on the server side.

    Outlook 2016 Sending Email Fails After Cipher Suite Update

    Mike
     
    Stop hovering to collapse... Click to collapse... Hover to expand... Click to expand...
    #6 mtindor, Jul 3, 2018
    Last edited: Jul 3, 2018
  7. IRZQ88

    IRZQ88 Active Member

    Joined:
    Sep 18, 2016
    Messages:
    26
    Likes Received:
    4
    Trophy Points:
    3
    Location:
    Indonesia
    cPanel Access Level:
    Root Administrator
    Okay, Once again thanks for your help! :)
     
    #7 IRZQ88, Jul 3, 2018
  8. cPanelLauren

    cPanelLauren Forums Analyst
    Staff Member

    Joined:
    Nov 14, 2017
    Messages:
    2,721
    Likes Received:
    186
    Trophy Points:
    143
    Location:
    Houston
    cPanel Access Level:
    DataCenter Provider
    Stop hovering to collapse... Click to collapse... Hover to expand... Click to expand...
    #8 cPanelLauren, Jul 3, 2018
  9. IRZQ88

    IRZQ88 Active Member

    Joined:
    Sep 18, 2016
    Messages:
    26
    Likes Received:
    4
    Trophy Points:
    3
    Location:
    Indonesia
    cPanel Access Level:
    Root Administrator
    Thanks a lot Mike! This actually works!!! I don't believe this!!! :D

    I see, Okay I'll check it up asap! Thank you Lauren!
     
    #9 IRZQ88, Jul 3, 2018
  10. cPanelLauren

    cPanelLauren Forums Analyst
    Staff Member

    Joined:
    Nov 14, 2017
    Messages:
    2,721
    Likes Received:
    186
    Trophy Points:
    143
    Location:
    Houston
    cPanel Access Level:
    DataCenter Provider
    Great! Please let us know how it works out and if you have any further issues.


    Thanks!
     
    Stop hovering to collapse... Click to collapse... Hover to expand... Click to expand...
    #10 cPanelLauren, Jul 4, 2018
(You must log in or sign up to post here.)
Loading...
Similar Threads - Outlook server doesn't
  1. Hugo Santiago Mendez

    Problemas Con Correo en Outlook

    Hugo Santiago Mendez, Sep 10, 2018, in forum: Discusión en Español
    Replies:
    1
    Views:
    425
    cPanelMichael
    Sep 12, 2018
  2. eusebio benito

    Desde Outlook me auto envío correo (a mi mismo corroe) y no llegan

    eusebio benito, Jun 28, 2018, in forum: Discusión en Español
    Replies:
    1
    Views:
    197
    cPanelMichael
    Jun 29, 2018
  3. Samet Chan

    Outlook/Hotmail won't receive on default email

    Samet Chan, Jun 7, 2018, in forum: E-mail Discussion
    Replies:
    16
    Views:
    247
    cPanelLauren
    Jun 11, 2018
  4. Braccio

    Mailing list Moderates Outlook Email

    Braccio, Jun 6, 2018, in forum: E-mail Discussion
    Replies:
    5
    Views:
    165
    cPanelLauren
    Jun 7, 2018
  5. Oualid

    Thunderbird and Outlook dont send email

    Oualid, Apr 9, 2018, in forum: E-mail Discussion
    Replies:
    1
    Views:
    137
    cPanelLauren
    Apr 9, 2018

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Accept Learn More...
    Dismiss Notice